Just bought a Holley 390 for my 292 (with a Mummert 265 cam) as I wasn't happy with the old '57 Holley #1273. Out of the box the 390 comes with primary jet size 51 and I'm thinking this seems a little lean, although I haven't fitted it yet. (The secondary jets are 53). Does anyone have the same or similar set up who could offer some advice on jet size as i'd like to try and get it 'right' if possible before installing it.

Cheers

Richard

Chelmsford UK