To actually smooth down the ports and polish is a power looser. Don’t do it.
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.
