Search "HEI fit" and start reading. Some combinations of frame stands and motor mounts will allow a big body HEI to slide in, others won't.
A quick check on your car is to take a tape measure reading from the center of your existing distributor to the firewall. If you have 2 3/4 inches at the tightest point (HEI cap is roughly 5 1/2 inches in diameter) it should fit. You need roughly 11/16 inches from the edge of your existing dist to the firewall.
My '68 had a 350 in it with an HEI, and the HEI was jammed so hard against the firewall it was impossible to adjust the timing. I have 327 stands, and the subframe appears to be about 3/8" forward of where it should be to center the body mounts. On the other hand, my subframe bushings were in pretty bad shape back when the HEI was in there which probably tilted the distributor toward the firewall a bit. I yanekd the HEI and put in an MSD 8360 long before I got around to replacing the subframe bushings.
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