I have a pump gas 410 cid in a completely stock, full trim, all steel 73 Duster and its ran a best of 11.2x @ 118..

My combo is..

4" cast stroker crank
HV oil pump
Kevko oil pan
Callie main and rod bearings with that friction reducing stuff..
KB forged step pistons 22.5 CC
Scat H-beams
Eddy heads ported by Ryan.. also shaved to obtain a chamber volume of 57cc.. which makes compression ratio 10.9:1
Heads flow about 280-ish cfm intake and 235-ish exhaust

Custom Ground Comp Cam 256/262 @ .050" Duration
108 LSA
.635"/.632" With Crane gold 1.5 roller rockers
Comp roller lifters
MSD billet dist.
MSD Digital 6 ignition box
Super Victor port matched (the intake was also shaved to line up with the shaved Eddys)
Holley 750

544 tq was obtained @4400 rpm
528 hp was @ 6000