Help me ID this 55 chevy small block

Well just to update, my buddy has been driving and enjoying his 55 since I got it Road worthy in November 2019. Now he wants to hot rod it a bit more. I had a 383 stroke built for him that I will be installing along with headers and he wants electronic cut outs. Since he is on a time clock with his eye disease, I’m trying to get it done as soon as I can. according to his doctor he has about a year left before his eye sight will get so bad he won’t be able to drive. Can someone recommend a good electronic exhaust cut out kit. He literally drives his 55 everywhere.

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