The Jalopy Journal
That's not a UC after the P55, on the right side of the B&M tag is where the transmission is ID as SS, = strip/street version. I have a unblown...
I have one that will get bolted up to a 1959 389 going into my 1953 Pontiac Chieftain Custom Catalina
One of the best dual range Hydra-Matic builders is Gene Berck in Salinas California, his website is restorationhydramatic.com
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The Jalopy Journal