Help with my first engine build (5.9 Magnum)

I was considering doing some mild porting to my cast iron heads. Just polishing the ports smooth, not removing much material. I'd be a little nervous to go hog wild on them my first time attempting anything like that. Aluminum heads are the plan down the road, for now I'm going to work with what I have.
To actually smooth down the ports and polish is a power looser. Don’t do it.
No porting at all, just OOTB. Air Gap and a 650 AVS with Doug's headers. 8.75 with 3:55's.
I just installed a 750 AFB on mine. I have Hooker 1-3/4 headers into a 2-1/2 exhaust. Also like yourself, an AG, 3.55’s rolling 245/60/15’s. Will be installing a 2500 converter in the 727 soon. Still mulling over a cam, but the shortages…. Ugh! Smallest cam I have on my shelf is a 230@050 and a 236@050. Which I’ll probably do the latter (236) with Rhodes lifters on the intake inky and drop the duration some. Might work OK.