Seems like everyone has put you on the right track. You've got to have a free flowing system to keep things cool. If all that does not work,and she still runs hot, the next step would be adding an oil and or a tranny cooler. My 351C was a big head ache until a added those and she stays at 180* all day now. Oh another thing many of us forget, Does it have a fan shroud? They do help quit a bit.
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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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