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Depending on the year, but mostly, swapping 340/360 heads onto a 318 drastically lowers the compression ratio, unless you spend loads of money on special pistons.
You can screw around milling heads, which leads to intake fit problems.
Putting a six pack on a 318 would be a complete waste of time, there are far better single 4 manifolds that will give you better performance on that combo
The sad fact is, that the way to more performance is to yank the 318 and find a 360--because 340's are getting rare
360's of course have their own swap problems, the pan is different, you need to change the flywheel for balance.
This, unfortunately, is one of the big screw-ups, so far's I'm concerned, with Mopar SB's, something the Chivvy lovers don't have
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