Headers wont fit either, will they? I know an older Ranchero around here in Corona with a C in it has to run Manifolds because of it being so tight. But I am a stupid kid trying to learn, so MAYBE the headers will fit? take another stab at it Tom now that I turned it a little bit.
Coustom headers will work (best friend runs a 351 in his 66' and man I hate helping him w/ it! talk about breaking knuckles getting spatk plugs in and out! Other option involves a Reciprocating saw and some sickening shock tower adjustments. (not for the squeamish)