Going racing + dyno tomorrow. Predictions?

So even though gas prices here in cali have spiked courtesy of a fire and shady oil company dirtbags, i'm going racing. Mainly because a local shop is bringing out their mobile dynojet.

Specs:
Junkyard 360 magnum(turned out to be a freshly rebuilt engine)
Hughes Iron ram heads(stock 1.9x valve)
Custom ground cam from IMM
crosswind air-gap intake
3000 stall convertor
Hedman headers
3.55 gears
edelbrock 600cfm carb
Timing set at 16 initial 32 total
Tuned via wideband to 12.5:1 a/f at WOT

Specs on the cam(though i know zero about them):
Gross valve lift: intake/exhaust: .513
duration @ .006: 276/282
duration@ .050 : 224/230
Lobe lift: .3210/.3210
Lobe duration: 110

Ran a 14.7 last time out with the late 70s tranny shifting at 3-500 in first and 2nd gear.(now using shift-r-gate to shift at 6k between gears)

Hoping to crack 300whp, though i'm gonna bet my heavy 17s will rob some power.