as seen as this is a build you'll be doing down the road..
I'd see if you can come across a 1987 up block as they are roller cam ready.. and the 100.oo you'll pay for it is cheap compaired to the 800.oo+ retro fit roller cam kit to go roller cam in that 1976 block..
if moneys tight. this might be the best 100.oo you spend before you start machining the block..
If not going roller.. then forget this post..