'Budget' 340 build suggestions
I think that balance job is expensive with the added cost, which should not be, for the flex plate/flywheel and damper. I payed $330 with all those parts @ Elssaser, Rocky Point on Rt.25.
Line hone shouldn't be needed along with a squaring of the block. While it adds to the excellance of a build, a basic street build doesn't need it.
MP has a gasket kit, IIRC I payed $60. While the head gaskets are not exacting for ever application, I used them. There bore is 4.1+++ X .039. Timing chain tensioner extra and not truly needed though a good add on.
By compare, I built my current 360 for under $1500, shortblock only.
Anytime you build up for a performance engine, nothing is cheap and no one brand gets away much better than another.