Just thinkin' ahead. I have a 63 D100 short box with a decent running, but tired, Poly 318/4speed. I've been casually looking for a big block bellhousing to accept the pass side slave cylinder just like it has now. Did the big blocks have the same slave setup and are there any still out there and what years to look for? Also, will the 318 flywheel work with a steel crank 440? I'm not gonna yank the 318 till it gives me trouble, just collecting parts at this point. Thanks