In order to gain the kind of power your looking for out of an olds, you must first of all remember, Dont treat it like a chevy! If you try to, it will tell you otherwise by giving you a nice metallic show all over the road. Ask my first 455 . anyway, A slight overbore would help you out, I would reccomend about .020- .030 over. Pay the extra money for the file fit rings, it will matter if you plan to keep this around afor a while. Also, edelbrocks heads are of decent quality, but I personally reccomend the High compression 70 factory high compression heads. (anyone remember the casting number? ) also, you can go and search for the oldsmobile faq. Theres some good info there. The w-31 cam was good in the 70s, but you can do better. Contact Comp cams, or mondello, they can grind a much better cam. As for the intake, you can hollow your factory runners, or replace it with an edelbrock unit. I had the edelbrock. This combo in a 82 cutlass 4dr (squeeze!) could pull low 13s with little struggle. I think I was pushing almost 650HP, and it would idle and drive street. Finally, Make A Ram Air System. On oldsmobile engines with their notirously high timing, this makes a world of difference. Hopes this helps.