Ray, did you fix it?
I have a 1966 caravel
. Copper lines for water and gas. You can bet that it was probably not want to ride properly so be prepared to replace the lines with PEX. You can buy it the pecs local big-box store however I would encourage you to buy the crimper kit from Amazon it's only $14 and it comes with fittings most likely your fittings will be either three quarters if you have a big line going in or mine had half inch.
On the gas lines I had to throw the old regulator away and I snaked out the lines with air pressure and a clothes hanger. That remove some dirt clots. Try to blow the long lines with the ends disconnect it so you don't blow trash into the device
Gas lines are not as difficult as they look to replace . You can get a soft refrigerator COPPER lines from Lowe's or HD $20 bucks. Its rolled up easy to bend. Go to harbor freight to get a hand held pipe bender $9 and flaring tool.. $7 small pipe cutter $6 . Cut off the copper pipe at the reuse to end connection caps.. you can get a few extra from Lowe's or HD. If the flares are not perfect don't worry these will flatten out once you screw it on the pressure will seal the unit when you connect in the refrigerator the furnace and the stove and the hot water heater back. Same with any Junctions and unions. Get some dishwashing liquid diluted 50/50 once everything is tight squirt on the ends and connections to make sure there's no gas leak. You'll find a gas leak when it starts bubbling up all you have to do is tighten try not to over tighten but keep tightening in short increments and then check what dishwashing liquid to make sure there's no bubbles what's the bubbles are gone it is tight.