Re: holley 850 dp jet sizes
A gap of 11 jet sizes between primary and secondaries seems a bit too much to me. If a Holley DP has a power valve in the secondaries then jets should be the same or nearly the same. Obviously yours has had the PV removed in the secondaries.
Also that jetting is pretty huge, I run a modded 750DP on a 378 that has a biggish cam and all i need to use is 76 primaries and 82 secondaries with #36 & #31 shooters. Jetting shouldn't vary much with an 850DP.
So in other words, the way that carb of yours is set-up you would need to have a very very hot 351.