Speaking from experience here, the 71 to 73 Mustangs came with a 429 optional, no shock tower cutting necessary. You could drop one of the FRPP 514 crate motors in with no problem,
Even the Ford FE series big block engin fits in the bay as I worked on one some years back that had a 427 side oiler engine in it and ran like a scalded ape.
I know also because I own a pair of 73 Mach I's, a 351 2bbl and a 351 Cobra Jet.
RacerX
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