Are my expectations too high?

I put together a 71 Duster with a 5.9 magnum basically duplicating the 360/380 crate engine. Its a 98 360 that is .030 over with stock replacement pistons. I'm running a .028" thick head gasket. 380 hp camshaft 501/513 hydraulic roller . M1 single plane intake. Hooker competition headers through flow master knock offs and turn downs at the axle. Holley 750 DP. Turbo Action 3800 stall converter. 727 with Cheetah reverse manual valve body. 8 3/4 with 4.30 gears. M&H Racemaster tires 275/60/15 in the rear with front runners. Car is pretty much a stocker except for no back seat.
My expectations are 11.90-12.40 range.
I used to run this car many years ago with same converter/trans/gears but I had a stock low compression 360 truck motor with stock X heads and a 525 solid lifter camshaft and it ran a best of 12.51 @ 107.
Just wondering if my expectations might be a little high?