273 302 318 340 build

Thanks for the in depth advice and responses. Doing the 360 right now wont happen as its in my truck which I use every once in a while(swap meets, dump runs, renovations). Time wise, space wise it just makes sense to do "something" with the 318 I have on the engine stand. I dont want to change rear gears. TC possibly, (current stall unknown)but still trying to keep it low budget. Ill try and figure out what stall I currently have.
I mentioned it earlier, but what I want to use, here is what I currently have so no $$ outta pocket
My cam/lifters/timing chain from 273 (270S solid from comp)
Set of 302 heads
Factory 273 adjustable rockers
LD4B or LD340 (Im leaning to LD4B)
Stock 1985 318 sitting on engine stand awaiting......???

I called the machine shop(long time mopar guy). Cost to bore 318 out .030 is $240. Seems like a good deal? $50-60 to get it dunked. So $300. A set of hicomp 30 over pistons approx $200.
Machinist also said to possibly advance cam 4* to wake it up.
Suggestions on size of overbore I should go?
Hicomp piston suggestions?
Heres some from Summit that RustyRatRod suggested in his "hot rod bliss" thread. Seem like a good deal for $106??
https://www.summitracing.com/int/parts/slp-526ap/overview/make/dodge
Upgrade to Moly rings?
Thanks all