my 95 3800 rosted it self, it locked now the good news the guy at work game me a 3.4 i know its smaller but do i have 2 change the wiring harness and do i have 2 change the ecu[]

 

if its the same year as your 3.8 then i shouldnt see why it wouldnt bolt up.

if not the parts you need to switch in and switch out should be easily to find. around here in junkyards their full of stangs and f-bods.

to show example, my moms bf's silverado motor blew and he bought a supersport motor for $500. ( though his brother owns it )