If you want to make good hp swap to a 68-70 pontiac 4 bbl intake. All part will be a swap from the donor engine to your 350. Oh and bye the way your engine is a 354 cid Pontiac rounded down to make it simple for people to remember. Get a 4 bbl Quadra jet from the same period and fine tune it. It will work great when you adjust the secondary flap to open correctly. Next will be the headers try to find a set with I believe 1 5/8 primary tubes. If you are going to which from an auto to 4spd trans you can install the 068 cam if you stay with automatic then the 067 is you best bet. You could save money by changing the rocker arms from the 1.5 to the 1.65 on one side I don’t remember intake or exhaust side. If you can find an old H-O catalog check which to change on your year 350. Nunzi’ catalog will have the same recommendation. Recurve the distributor and you will be happy. Should you want more get big valve heads # 12,13, or # 48 from 1970 if you have the extra cash
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