Will a 77 Charger 360 fit in a 65 Valiant Slant Six Painlessly?

Ah - forgot the 65 trans took a ball and trunnion front joint. But, yeah.

There's also pulleys and brackets. Will the 77 360's pulleys and brackets fit in a 65 Valiant??? Don't know. May well not, especially if the 77 had A/C. Might need to scrounge around a bit to find what you need. And keep the original alternator unless you want to do some rewiring for the later alternator and voltage regulator.

Like RRR said, all this is basically bolt on stuff, but it's a LOT of different stuff to bolt in. Lots of little stuff changed from one year to the next. Fact that the donor car is a B body is not that big a deal, since a small block is a small block and a Torqueflite is either a 904 (or one of its variants) or a 727, and are the same length for A and B bodies (unlike 4-speeds). But the factory liked to change little stuff, like where the trans mounting pad is on the trans, kickdown linkage, shift linkage, throttle control mechanisms, locations of radiator outlets, etc. Doubt anyone can remember in advance everything that will need to be done in your case. I know when I put a 74 360/Torqueflite in my originally slant six 67 Barracuda, I was surprised at all the little things I had to figure out - like what power steering brackets I needed to bolt to a 74 engine sitting in a 67 chassis with a 69 K frame with 69 motor mount brackets (74 brackets didn't work). And I already had converted to V8 HD suspension, brakes and 8 3/4 rear, and had a V8 K frame ready to go (unlike 63-66, by 67, V8s and slant sixes used different K frames).

And we haven't talked yet about suspension and brakes. Factory slant six stuff will be kinda marginal for a 360. Count on upgrading that, too.

Anyway, I don't mean to discourage you. Just be prepared to do more and spend more than you originally planned.