Would high-volume oil pump help?

What I mean by slightly build; I've had the car 21+years and it was built/restored by 3 farmers in Illinois, in a barn. I bought a new 71 Demon340 in 71 and the cam didn't lobe like this one so I'm assuming it is slightly built; stock intake,stk carb,stk 4 spd, stk 3.55, stk rallye gauges. RRR is (unfortunately) probably right. However, it in no way runs tired. The visual oil gauge reading has been low on and off for three years. It sits for 3or4 weeks at a time and when I drive, it's not usually more than 25 miles. I noticed a little exhaust smoke yesterday while taking off at a light. If I got 22 years of fun, maybe it's just time?