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I have a smallport 4age and I am in the process of fitting it with twin 45 carbs and putting it in my ke70.
I've read up a fair bit about the ignition setup and only found that you can use either a modified 4k dizzy or the dizzy out of a bluetop 4age with a msd setup.
I am wanting to go down the road of msd but havent found any info about if I can use my stock smallport dizzy with an msd setup.
If you can't use smallport dizzy with msd would you know if blutop dizzy fits into smallport head?

Any distributor from any 4AG will fit any 4AG. I can't vouch for all the distributors working with all the ecu's though. As for carb'd applications, you'll need a stand alone timing controller to induce timing advance with the 4AG dist. You can use almost any early Toyota distributor with mechanical & vacuum advance capabilities for proper timing with some form of adapter & the 4AG distributor driven gear.