If it's the same MC I have, you can safely trim the big protrusion on the front with an angle grinder, and it will JUST clear. An SVO MC which is the most common for this is 8.125" long, and if you've got a 7" booster, you're screwed unless you trim it.
I managed to find a shorter, smaller diameter booster that is a drop in fit, but I haven't been able to pick one up to experiment on. (SVO MC on a chevy booster

) I'm not paying $100 for something at autozone to find out I can't make it do what I want it to do.
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66 coupe 5.0/T5, home-brewed power 4 wheel disc setup, 350hp+, looks like it belongs in 1968