Vacuum Secondary Conversion

So I have a low profile (and it needs to stay low profile) mechanical secondary and carburetor set up on my 340 automatic. Running a 6AL box with a MSD Billet 8534 non vacuum dizzy and a 4150 Double pumper with mechanical secondaries.

I understand this is not the best set up for drivability in an automatic trans set up. So I am looking to convert to vacuum secondaries. My set up is practically new and I dumped a lot of money into it on bad advice.

So my question is what is a decent distributor given my set up and requirements?

Are these any good?

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