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I contacted that guy I got the 400 from, it was a transplant into the 68, it's actually a 74 motor, which I guess I had forgotten about because when I described building the 74 roadrunner I told him that I thought the 400 was the biggest motor that year available with 4speed, and at the time...
Lol true, I guess I could just get a crank, although I did tear the 413 down to see what I had purchased, that's how I gave up the parts list, bought it off ebay for 100.00 didn't do to bad I don't think.
OK here goes I've got a 74 roadrunner with a 1968 400 motor out of a charger it's got a Mallory ignition and a holleyes street avenger that's about all I know about this motor it runs good and I'm assuming the internals are stock, I also have a 413 punched out .30 with flat top pistons, 906...