could be needing the grounds cleaned if it has been sitting.. stat with VR and ECU on firewall..clean the spots for a good ground.

next up would be have a look at the carb..the gaskets shrink when sitting and the crap fuel now days leave deposits/water in the bowls when evaped empty over time. also check accel pump for a good pump shot when working the throttle. have a look at the rubber lines at frame/pump and frame/tank to make sure it is not sucking air with bad rubber lines.

give it some idle time to pump lifter up good and come up to operating temps idling in N so the trans pumps fluid.

stock 74 is a lopo smogger and will always run better with the timing set up close to 10* for a daily driver. if the BBD 2-v carb is up to par that is.

I would advance it up close to 10* BTDC and test drive working bugs out before any WOT blast with it.