The high efficiency series from Lunati has 207/207 .461/.461, perfect for a mild engine. A stock smog 455 cam or 307 HO cam is more options. I would pay the extra for a pair of .011" shim gaskets from M+J Proformance. Even with those gaskets, you will be at 8 to 1 compression. With your basic .040" replacements that came in your gasket set, around 7.7 to 1, horrible! I would save and have them milled, 3 angle valve job and bowl work. Rocket Racing is close to you, they may even have head cores. With early heads, you will be close to 9 to 1, have better flow on the exhaust side and allow for a better cam. I did a cheapo rebuild on my 403 with the same #8 heads, Came out to 8.3 to 1 with. 028" Corteco gaskets. I used the Performer cam, my compression is so so. The car is fun to drive but track times have been disappointing. I spending on milled Edelbrocks with mild work and 1.7 roller rockers, next year. If you just want a nice cruiser, go with those thin head gaskets and any of the above cams. Also go true dual exhaust, factory Olds exhaust is awful.