True HEI distributor conversion thoughts

RustyRatRod said
I have the big cap GM HEI version in the 351M in my 75 F250. Been in it for about three years now. Hasn't missed a beat. Comes with about 20* mechanical advance. I limited mine to 15* by drilling a small hole in the breaker plate and installing a screw to stop the advance plate. I have it set on 20* initial and 35* total. So far it has run very well. I have zero complaints.

All these type are the same, whether they are Skip White, ProComp.......whatever. Although I have read about some issues, I drive mine everyday and have zero complaints.
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Thanks Rusty.

Do you think the HEI would clear a 65 flat firewall? I've read it's 5.5"

Cosgig was kind enough to measure his 66 for me today and he said he had 2.5 inches above his stick distributor, and 1" to the firewall.

Mathematically it should fit, but I'm planing on measuring when we drop the engine in next month and reporting back.