Are parts more readily available for the 340?
the 300ci was in production from 1964-67 while the 340ci was in production from 1966-67. so, no.
www.TAPerformance.com has an aluminum head for the Rover style engines, but that would work on either deck height ( 340 is taller ).
simplest swap would be a Buick 350ci, 1968-82. no alum heads yet but TA has a single plane intake for it. best years would be 1968-70.
the usual replacement is a Buick 455, which would require new engine mounts, new fan shroud and radiator.
I was also thinking about swapping a chev 327 in it.
a Chevy would only match up on 2 bolt holes + the dowels for the trans housing. so you'd need to replace the trans as well.
however, if it's a TH-300 2 speed, you should probably swap that anyways.
also, everything electrical on the Chevy ( distributor, starter ) is physically backwards from the Buick so you'd have a bit of rewiring to do.
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