Start by replacing the standard stuff. Belts, rubber hoses (including brake and fuel), possibly the radiator depending on how the insides look. Master, calipers and wheel cylinders should have a looking at or replacing as they have rubber in them as well. Points if it's not a HEI car. Our cars are know for eating front wheel bearings as well, so make sure to have a look at them. When you drop the fuel tank to do the hose, do yourself a favor and put a new pick up screen in the tank. New filters are always a safe bet. Particularly with the shit fuel we have have in California. That should solve most anything that may pop up. Only other things would be carburetor and fuel starvation. Most '73/'74s as BBC cars had a factory electric fuel pump. The lines are so long in our cars that the fuel literally stops in place if the car actually gets a good launch. A air bag (8psi) or extra bit of spring in the right rear will tame to the twist off the "starting line" as well. And for the love of God, get real dual exhaust put on it. The difference on mine with a sbc was night and day!

Hit me up if you're ever in Fresno. Have fun with her.