I’m looking at buying this 408sbc near me, it’s fresh build but I’m new to the engine stuff, I’m wanting to see feedback on this build and potential hp and tq it could make.... the build is as follows

Sbc 408 just freshened up, only run time on engine stand and can hear run. 40 over 3.75 stroke.
Dart SHP block
King coated cam bearings
King high performance main bearings. 010 over
King high performance rod bearings. 020 over
Mahle forged pistons w/ mahle rings
Eagle crank
Eagle rods
Melling hv oil pump
Comp extreme energy roller cam xr286r
Comp roller lifters
Comp magnum push rods
Dart aluminum 180 cc heads 72cc combustion
Holley high rise
All arp bolts
Motor is a 10.2:1 pump gas motor.

Would be goin In my 66chevelle 300...th350 trans and 12bolt posi rearend