This might sound silly but dont you already have 5 lugs? Never heard of early stangs with a 4bolt pattern.
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1970 Stang Conv:
en:Boss351 (balanced/blueprinted)
mech cam(240*@.050/.540 lift)
Scrw in studs/comp cams rllr rkr
Mldn valves 2.19in 1.71ex
ported polished cc'd hrdnd ex
Keith Black FT pistons(10.25/1)
Weiand Excellorator manifold
Holley700 DP mech 2nds
MSD 6 box and Dis
Headers/2 1/2 inch duels
tr: modified FMX
re:9-inch/3.89 limited slip
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