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I have been looking at sport mod engine options. The rules at the tracks I will be running out rules out vortec heads so a 602 crate is out of the picture. I seen Karl perfomance has some different options available that are not to crazy priced does anyone have any experience with them? or know of any other option Rules:A. Engine Block-OEM Cast Iron only. Maximum cubic inch limit of 390.B. Crankshaft-Must have a stock appearing rear crank flange. Balancing OK, Nolightening, knife edging or reducing of the crankshaft circumference.. Must be castiron crank, no steel.C. Harmonic Balancer-Must be of OEM design with rubber mounted dampener ring(SFI rating recommended)D. Connecting Rods-Must be of OEM design (IE If stock rod was “I-beam thanAftermarket must be “I-beam). Rod length is up to engine builder (does not have to beOEM length). Rods may use bolt and nut or cap screws to secure the caps.E. Pistons- Cast or Forged, Flat top or Dished. No domed or gas ported pistonsallowed.F. Camshaft-Hydraulic camshaft only. No roller camshafts allowed. Must pull 15inches of vacuum at 1000 RPMs. Must have access to vacuum port in manifold. No4-7 swaps.G. Cylinder Heads and Valve Train-Must be unaltered approved OEM. All headsmust have been used in a production vehicle. No limited production or specialpurpose over the counter only heads allowed. No porting, polishing or unapprovedvalve bowl work or other alterations of any kind to heads or intake. 202s allowed. Noscrew in studs. No pin studs. Must use stock diameter valve springs. Stock steelstamped rocker arms. No beehive springs. No studgirdal. No VORTEC heads.Polylocks ok. No canted value (Cleveland style) heads!H. Exhaust-May use aftermarket headers. Exhaust system must be mounted in sucha way as to direct spent gases away from (not a nice word)(not a nice word)(not a nice word)(not a nice word)pit of vehicle and away from areas ofpossible fuel spillage. Exhaust header outlets no higher than midline of the bodysides. Officials may require turn downs on the collectors. Dual exhaust only no “Yâ€Âpipes or 180 headers. No oxygen sensors allowed.I. Intake-Any cast iron or aluminum intake. No porting or enlarging inside of intake orgasket matching. No Bowtie, VORTEC, SVO or W2, marine or other specialproduction intake manifolds. No intake manifold to cylinder head spacers allowed.J. Carburetor-2 barrell Holley 4412 only. No grinding or polishing of any kind allowed.All carburetor components manufactured by Holley. No Aftermarket base plates,metering blocks or carb bodies allowed. No milling or grinding of throttle shaftallowed, shaft must stay round. The choke and air horn may be removed, this is theonly re-working allowed, must have stock measurements. Carb gauges will be used. 2.Steel, aluminum or Phenolic adapter plate or spacer allowed. Distance between thebottom of carburetor and top of intake manifold cannot exceed 1.25 inches! Total spacerheight includes gaskets.K. Fuel Pump-OEM style diaphragm pumps only.L. Ignition-OEM Stock appearing Distributors only (all components, even coil cover).Must run stock firing order. No MSD boxes.M. Cooling System-Cooling system may be modified. Radiator and oil cooler mustnot protrude above interior. No electric waterpumps or cooling fans. No sprinklersystems. Any overflow tubes are to be directed to the ground, between frame rails.N. Starter-All vehicles must have the capability of starting without being pushed orpulled. Starter must bolt to engine in factory location.