I have built hundreds of these over the years all you need to do is lube up the front drum and seals real good and just wiggle the piston while applying pressure and it will slip right in no need for zip ties or a freezer.

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4