351W in a 64.5-66?

You need special headers.
Plug changes are tight, but I don't see lifting the engine.
Headers are available from a few sources in 1.5" primarys for a street cruiser, or from Hooker in 1.75" for street/strip.
It is a bolt in swap.
The stock oil filter location will work, but some headers, especially the Hookers, get very close. A 90* adapter or remote filter is best.
Tall intakes, like Victor or Air Gap have hood clearance problems.
RPM and Stealth are tight, but not as bad.
Torker 2 is stock intake height for a sleeper look.
Dave

the 351w fits fine in both cars, the 67-70 has few issues, jus the need for swap headers is all. in the 65-66 cars, swap headers again are all that is really needed and hedman and hooker both have them. plugs changes are a bit harder, but not so as you would notice. for the 65-66 cars i recomend the shorty swap headers as you have better clearance under the car. in either case the 351w bolt right inplace of where the factory 289/302 went. one other item with the 65-66 cars, the shock tower have a tendency to sag over the years, so after you have the old engine out, and before youinstall the new engine, install an export brace. that will get the shock towers back where they need to be, then install the new engine, and a monte carlo bar as well. they make a BIG difference in the front end rigidity.

rbohm said:

the 351w fits fine in both cars, the 67-70 has few issues, jus the need for swap headers is all. in the 65-66 cars, swap headers again are all that is really needed and hedman and hooker both have them. plugs changes are a bit harder, but not so as you would notice. for the 65-66 cars i recomend the shorty swap headers as you have better clearance under the car. in either case the 351w bolt right inplace of where the factory 289/302 went.

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Did you use the Z-bar clutch or a hydraulic clutch? Toploader or T-5?