To help the pep of the 260... Don't go running the plug gap at .30 or.40 unless you plan or running a points dist. But I am assuming you have an HEI and those like to be run around .60 maybe .50 if you just have a desire to shortrn the gap. Since all Olds small block parts are 99.9 % interchangeable (330's being the exception because of a different cam bank angle) I would go back to the wreckin yard and find a set of heads off a 307. This will yeild good compression, and give you just about double the flow because 260's come with stupidly small restrictive valves and runners. Also find an A4 alluminiom ( <----yeah I can't spell) intake off a 307 this was the best stock intake from this year range and has large good flowing ports that will also make power. Run the timing between 12 and 16. Also try to use Accel ignition parts, Olds likes them. What ever you do don't just the plainum plugs Olds V8's hate them. But remember it is still small even if you get these better parts don't over carburate her, with these improvments she will breath much better but I wouldn't go over 600 CFM. Hope this helps and you get your 260 flyin