help with sbc

good morning im trying to build a motor for my 64 swb chevy.its all original as far as trans and rear.i have a 350 040 over w low compression pistons to build.im looking for torque i pull cars with it.(the 305 thats in it now is weak.)what heads are best for pulling also.any suggestions on a cam thanks.im trying to do this with least possible$$$$$$$$.still got to feed family

 

882 heads with a rv cam works best for me. Now thats just my .02

 

keep stock heads and do a "gasket match" port job on heads at intake and exhaust ports and intake manifold on ports AND carb base, use HEI dist and I like 300 hp 327 Crane blueprint series cams for towing. (.447 specs?)