critique my 340 w2 combo please

With Jim doing the cam and 5 gears how could it be a pig down low?
I bought the cam used. This is kind of a throw parts I have laying around on a budget combo, so Im wondering how it will run. Also my first engine build.

The machinist I had do the block and flow the heads is a chevy race engine builder in the area, has never seen w2 heads and was worried about the port size. He compared it to a boss 302...