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i have wiried up a cobra with a mustang 4.6 in it

they are very big motors

throttle body stuck way above the bonnet side lines
and sump hung down low enough to worry driver over bumps

it can be done but more work is involved

ive also done an aussie ba 5.4 into a 67 fastback mustang
they had to refit thinner inner strut tower guards

plus the aussie 5.4 is not as good as the usa 4.6