The 400 has a big block bell housing.
The 400 is basically a Cleveland with an extra inch of deck and a big block bell housing pattern. You could source a rare FMX block with the small bellhousing but that isn't the smartest thing to do. FMX blocks are rare and if you have any trouble you have to source another rare FMX block.
400 block core charge was $50 as they are very common. Having a bell housing that fits the common block is golden.
Now Quicktime makes a big block bell housing but it is for the GT 40 with the ZF inverted. It has to be drilled for the Pantera.
I hate calling them "Big block" "small Block". That is really a Chevy term.
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