Hey guys, I was wondering if the GM, PN number kit 12480002 (HOT Cam) would fit into my 1989 350 4 bolts casting # 638.

The block originally came roller.

Heads are casting #083 (Hi-Flow heads from 300 hp GM crate engines). They care cast iron and I believe that they have 3/8 studs with 1.5 rocker ratio.

Can I upgrade to 1.6 roller rockers without changing the studs?? I believe they will not clear the valve covers either...

What mods will I have to do to the engine??

Should I simply go with with the good old ZZ4 camshaft and springs? I'm not trying to build a 10 seconds car here, just trying to have plain fun on the street (+ or - 350hp)

Help would be gladly appreciated!!