another what do ya think it will run post

[GMC70c20]

Well Its been a LONG haul on this project. At first I was going to just throw a little motor at my long bed c20 and call it good. Then one thing led to another and and now its shortened, lowered 4in frame has been boxed all the factory cross members are gone and replaced with 2"od mild steel round tube, and thats just a start. I've been workin on tis thing for about 3 years and am prob within a year of being able to drive it again, so I've gotta ask what do you think it would run. Here's the specs

lq4 with the gm "hot cam"
factory injection (execpt injectors)
88mm garret turbo
not exactly sure on hp but it should be somehwere around 575-600 athe the crank
engines set back 4" from factory location

turbo 400 with brake and manual valve body
8" tci converter with 3500 rpm stall

9" with 3.54 gears and detroit locker

fatman front axle with qa-1 ajustable coil overs
glass hood and no heater or ac

4in drop monos in back with qa-1 ajustable shocks
and caltracks mt street ets 275/50-15
not 100% on the weight bias but it should weight about 3200-3300lbs without me in it
so figure 3500lbs with me in it and assuming it actually hooks