You'll have to check this to be sure, but I know that on bikes from the 70s, a bolt-on axle was a smaller diameter than a QR axle. Therefore switching to QR if the bike originally came with bolt-ons only worked if you spread the dropouts a bit. If you can find a set of QR wheels to try, see if they fit inside the dropouts/fork tips easily. If not, then you should consult a bike shop to see if the frame can be modified to fit.
If you're having trouble loosening the bolts to get your wheel off for a tire change, look for a longer wrench.
Oil is good, grease is better.
2007 Peter Mooney w/S&S couplers/Terry Butterfly
1993 Bridgestone MB-3/Avocet O2 Air 40W
1980 Columbus Frame with 1970 Campy parts
1954 Raleigh 3-speed/Brooks B72