I did the same thing with the Delco mag replacer only I used a 4 cyl Chevette HEI short cap distributor for our puller DC. Turned the base to match the old dist. and slid the drive gear on and with the thin thrust washers off the old distributor the roll pin hole was even right. I did remove the vacuum advance and made the pickup plate stationary and did work on the advance weights to increase the mechanical advance for pulling. Very trouble free distributor.
The old distributor you are using is just fine with the loose shaft if the weights and springs are otherwise good. The loose shaft makes it impossible to hold points adjustment. The pertronics unit uses a magnet ring and pickup module and precise does not matter with this setup, that is one thing attractive about Pertronics. I have used many in stock and performance applications and all work well if the rest of the tractor system is up to par.
For those of you that use MSD boxes for pulling applications the wide cap spacings are almost a necessity as with extreme high compression engines such as we use in pulling the spark will jump from the tower down to the clips holding the cap on. Once this happens the cap is junk. Don't ask me how I know!!
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