Opinions on exhaust

Thanks, here are a few more details of the motor, we bought the short block from Muscle Motors. Andrew

400 Block
Comp Cam custom grind solid roller .631 lift in & exh, duration at .020 286 / 292 @.050 250 / 256 110 LSA installed at 105. Valve timing @.050 Int 19 BTDC 51 ABDC EXH 62 BBDC 14 ATDC. (spings installed to match 210 seat pressure with 10 degree locks)
Forged pistons 10.55 to 1 with 84cc eddy heads & .040" gasket
RPM intake
850 DP
-15cc dish piston. size 4.375
4.25 stroke with H beam rods
Zero deck
Crane roller rocker 1.5 ratio with 1 thread showing
High volume oild pump and 7 qt Milodon Pan.