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Once again I am compelled to jump in.  After installing two chevy motors
into 63 Avantis I can offer this.  Use the origional motor mounts used on
the Larks with Chevy motors, bolt right in.  Block hugger headers are neat
and work well.  If you use a turbo350 or 400 trans you can make a single
plate that will hold the stock chevy trans mount and bolt it to the short
cross member.  The stock shifter will work with a little longer linkage.
The challenge is in fitting a air filter.  You must use the shortest intake
manifold possible.  Also, the chevy engine will weigh about 150 lbs. less,
so the front end will sit higher.  I usually cut the front springs one coil,
but this is a compromise.  Shorter springs and shortening the travel limiter
(rubber cone shaped thing), restores the rake, but not the ride.  A GM power
steering pump works with the rest of the stock power steering system, but
you will have to use a similar size pulley or you will have problems.