Like YR says; that combo need 4.56s and at least 275/60-15s. which are like 28 tall or so. With those and your current 2500TC and a 1.45 second gear, you can hit 60 mph at;
(60x 1056x4.56x1.45)/(28x3.1416)=4762 at zero slip. Figure 5000 minimum to 5250, with the TC slip; just about peak power with a
[email protected] cam
BTW;
A stock 340 auto car should have come with 3.23s. With a 3.23x2.45=7.91 starter gear and a solid 10% in the TC ,yur looking at a starter gear of 8.7 to 1. At 2500 your "hi-compression" 340 should be putting out over 200ft lbs. So; 200x8.7=1740 into the rear axles. That's a pretty normal number and should be real peppy. Especially when you nail it on the line, at zero mph, cuz this could grow instantaneously to over 3000 ftlbs, which should be enough to break any street tires loose. After which the 1740 will climb to perhaps 350x8.7=3045ftlbs at say 3500rpm, enough to sustain the spin all the way to shift-rpm.
So, if your 340 is dead off idle and not doing that,then the first thing I recommend is to verify the rear end, and the second is a compression test.
Hyup 2.76s would kill it, but so would a 292/108 cam, and so would a smogger-340 in a rotten combo. So before you spend a wheelbarrow-full of doubloons, with only modest gains, I recommend you first check out what you have. If you already have 3.23s, then 3.55s are only 10% better so not a big change. And a 2800TC, altho I love those, is also only good to wake up say 10 or 15% more torque over the 2500.
But if your cylinder pressure is down to 130psi that combo is gonna be doggie no matter what you do. Arizona has elevation changes all over the map, and if you are stuck at high elevation, (mean elevation of Arizona is ~4100ft), you are gonna need some serious cylinder pressure to get Un-doggie.
Jus saying
