Turns out the casting number on my intake manifold is not necessarily for a corvette. It is 3973469 which is all passenger cars, Cast Iron, 270 Hp for a 1971 350sbc. So perhaps it is original...
I am certain however that the carb is not. It has an identification number of 7042237 which is apparently for a 1971 Cadillac 7.7L 472 engine or 8.2L 500 engine. Woah. Perhaps it is a refurb that was metered to work with this application? I think I will be in the market for a new, correct, Quadrajet...
According to the chart below I need to be looking for one that is numbered 7042210.
However, according to cliff's High Performance ID page
http://www.cliffshighperformance.com...carb_ID_2.html
The following numbering convention applies:
70 = Rochester
4 = 1970-1975 era
1 = 1971 model year
2 = Quadrajet 4BBL Federal Standards
0,1 or 2 = Chevrolet
0,2,4,6 or 8 = automatic transmission
So I need a carb with one of the following numbers:
7041200, 7041202, 7041204, 7041206, 7041208
7041210, 7041212, 7041214, 7041216, 7041218
7041220, 7041222, 7041224, 7041226, 7041228
Does anyone know whether the variations on the Chevrolet numbering or the automatic transmission numbering matter? In other words, does it matter, for correctness, whether I get a carb with any of the 15 numbers above, or will any one do?
Thanks