Not to sure if the OPs engine is a running engine at the moment. I think that is what he is trying to say , but he hasnt been back so I we dont have any way of knowing.
If he has a running 350 , the least expensive way to get a few more horses from it would be to put a Comp XE in it to help it with its breathing/anemia problem. Sure...A 350 isnt a desirable choice if you are going to build a complete engine. But if it runs good allready a cam upgrade would be a plus to help it out.
A 350 with a 2 barrel and a decent cam could be a fun daily driver and still be cheap enough to drive evryday.
Would I build one from a bare block....NO.
Drop a cam in for 30-40 more horses...any day of the week.
Fact is stranger than Fiction