i was wondering how power i am making, this is my old 383 afr headed (around 11.1) motor that MMS built back in 2001, its got ported AFR 195, 2.02-1.60 valves, ported LT4 Manifold, 58mm tb, hooker long tubes, 3inch ory, with single 3.5 inch exhaust, CC306 cam, 1.6 crane RR

MMS dyno it back in 2002 it put down 426rwhp 403 rwtq, with a soso opti, do these figures seem correct or possible, if i take it to get it retuned ( i think theres some more left in it) how much power could this combo possibly make?
sorry for my for ignorance, but i have been out the Lt1 for a while, into my LS1.

 

anyone??

 

noone has anything to say????