To convert to discs or not convert? That is the question!

My vehicle is a '74 Dodge Dart Swinger with drum brakes all around.

I couldn't afford to convert to discs at this point of the mechanical fixes and spent a month finding a brake booster/master cylinder for all drums and subsequently replacement drums for the front

My original intention was to upgrade in 7 months when more funds become available, but while talking to Austin Texas' guru of brakes (as recommended to me by area mechanics) he advised against it because the replacement parts for kits are 'purt near impossible to find.

If it weren't for the discovery of this forum I would have never located the drums, the car would have been shelved for 7 months or sold loosing a good deal more than I would like$$$ Most buyers enjoy stopping.

I need direction and reasons in terms a non-mechanic could understand. Upgrade to discs or keep all drums?