The TPC 660 Holley is an 1850 configured inline carburetor when set-up in dual fashion. The 850 baseplate mod is a carb builders modification. I don't know of any builders who perform this modification at the level I do besides myself.

Yes I offer this service to all List#4224 holleys 660 center squirters, and they are flawless performers for the street!

Call me if you're interested.

~Ty
[addsig]