I think he already put a set of speedmasters on that one. 238@.050 solid flat tappet with matching springs, 1.6:1 rockers, and converter would be large step to the low 12s.
Yes, i did a test of "what if" you dropped a set of 700 dollar black friday SM heads on a stock 360... dropped 2.5 tenths over the stock smog 360 heads