It will fit since the 403 was offered in the 79 body which is
substantially identical to 1980. The motor mounts probably will have to
go, but the ones with the Olds motor will be fine or else you'll have to
get some. Any Olds V8 mounts from 307 cid on will work. BUT, the
accessories on the front of the 403 and Chevy 350 SB are mirror images and
that will reult in a big bracketry and plumbing hassle.
You will need to move the mounts, as well as use olds mounts. 78-81
Firebirds could be had with olds 403's so the mounts can be found at salvage
yards. The transmission will need to be changed if you old engine was a
Olds and Chevy brackets do not interchange for this.
You will need Olds V8 brackets and mounts. The mounts any parts store should
have. The brackets, from a junkyard, GM, or Ebay as suggested.
The 403 is a big league pig. Why you want to put this in the car is beyond me
Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director
'80 Carousel Red Turbo T/A, 26k orig.
'79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig
'84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 141k and still going....
'80 T/A project car...
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