Need help with head

I need to know if either set of the vortec heads produced from 96 to 99 will fit on a 1977 Buick block if they will will they just bolt up or do I need to have them machined

I also need to know if a chevy cam will fit or do they make a different style for the Buick

Thanks in advance for all your help I can be contacted on here or through email at cadank88@yahoo.com and thanks again

i believe 77 buick block is differant from chevy,what block is it 350,403,455,if it is one of these it's not going to work.

The heads wont bolt on a buick block.350 400 and 455 were buicks, along with the 401 425 nailheads.The 403 was an olds .If you want good info about buicks, go to v8buick.com.Everything you need to know about them.