Would you be able to afford to make another hot rod while you payed off the marauder?
My opinion is that you should keep the engine and trans you have and buy the marauder with your money. There will ALWAYS be fox body mustangs around (especially ones that are non-V8) that people want to get rid of real cheap, so you shouldn't even worry about finding another mustang for that engine and trans. You may have to delay building the hot rod stang for awhile, but i can tell you that there's no shortage of cheap mustangs to use as shells for a hot rod. Good luck!
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previous name: 84stangLX
'84 Mustang 5.0 LX
my LX
'89 Mustang GT
my GT