73 340 SB Rebuild, Need Help Selecting Parts
TNT
You are right on the money of what I need the motor to do
I autocross too. I haven't raced in a few years but next summer I'll be screwing around doing some autocross in my '78 Magnum for kicks.
That looks like a stock '73 340 engine to me.
Considering your budget I would sell the 340 and buy a the lowest mileage 360 magnum you can find to build. Sell your intake also.
With your budget and gearing in mind keep it pretty simple. Put some Eddy magnum RPM roller heads on it, switch to a performer rpm air gap magnum intake with a 650-750 double pumper. Use a premium double roller t-chain w/ tensioner, have camshaft reground or buy a new roller cam and put some adjustable roller rockers on it with new pushrods too. I would use a HV pump with a HD pump shaft and some oiling mods listed above in sticky thread(not sure how much applies to a magnum engine) and a Kevko oil pan.
You'll need a B&M flex plate meant a 360 magnum and to remove the balance weight from your converter or use a slightly higher stall quality convertor(someone would probably buy your stock one). I'm assuming you use a sure-grip in the rear diff.
That would be a good budget build for you and should achieve your goals. There are quite a few members here who are very knowledgeable the magnum engine swaps that can answer any questions. I would think a 650 double pumper would be my choice in carb size personally.
This should stay within your budget once you add the sale price of the 340 onto it and be a great set-up with the extra power and weight savings.
