318/360 heads,with thumper cam

7duce swinger, please read my post #22 and should help you understand what i'm saying here. Gonna try and narrow down 1 option for you,

Gonna throw out the horsepower #'s for now. Assuming the shortblock is fairly sound, i would mill the heads a resonable amount, some threads here or one of the cylinder head guys could advise you on what's a safe amount. Have a good valve job done and make sure the springs are good for you cam. Use a thin head gasket and get as much comp. as you can.
Use the iron 360 manifold and 650 spreadbore, it will definetly need tuning for your combo. Now this combo will be a liitle soft on the bottom end with 3.23's, but you'll be able to put a good amount of timing in it and it would be pump gas friendly. Put a decent converter behind it and you should have a pretty good perfomer that sounds good for not alot of cash outlay. Enjoy driving it for awhile and save up for that new Magnum powerplant:).