Unless my manifolds got switched around somewhere back when I did the engine swap from 283 to 350, I am pretty sure I have the correct manifolds on there now.
My existing 2 inch manifolds are left 3846559 and right 3747038.
Car and Truck shop wants $350 for what looks like the correct 2.5 inch left side manifold 58-10406 (NOS) but they don't bother to list the casting number. They also have a right side manifold that looks right, but is only 2 inch 65-10407.
Yes, this is going to be a dual exhaust. Originally, with the 283, it was a single exhaust, but I had a muffler shop put in a 2 inch dual system long ago. It is pretty well rusted out now, and a fairly poor job was done.
The Ebay repros have the wrong alternator mount cast in them, plus they are selling a pair of left hand sides as a "set". Which means you have an alternator bracket facing the firewall on the right side. Not only is it not correct looking, it is ugly and may hit the firewall. And I doubt they have the choke heater tube in the right side.
According to my book, "Chevrolet by the numbers", the casting numbers (or copies of) that I need are :
Right side 2.5 inch for 1964 3797942
Left side 2.5 inch for 1964 3846563
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