Hi Ray, I bought my HEI dist. from Speedway motors part #2896513 for $87.99. You will also need a set of spark plug wires for a small block Chevy with the HEI dist. about  $30.00. No other parts are necessary unless you want the connector for the Positive wire to the dist. Most auto parts stores will have this. I know NAPA has it. All you need to do is disconnect your connector from your Ign. module and the wires to and from you ballast resistor. Find the 12 volt wire from the Ign. switch to the ballast resistor and add some wire to it that reaches the dist. Add a female spade connector to this wire. Your new dist only needs one 12 volt wire with power only when the key is on. And no power when key is off. I assume that you know how to replace your dist. so that it lines up correctly. If you need more help, let me know.

Congrats on your dreamer Ray. 77 must have been a good year. I also bought a one owner 77 Motor Home; It's on a Chevy G30 chassis. mine has that 70's vibe as well. plaid seats and orange and Brown stripes on the exterior. I like your rear seating area, very nice and clean as well. I put new tires on mine as I had a blow out on my way home. Check your date codes on your tires, mine still had the mold tits on the tread and the tire shop wouldn't touch them. An other thing was a bad brake hose caused me to flat spot a new tire within 200 feet of where I had the tires installed. Lines are cheaper than tires LoL. Anyway I hope you enjoy your new Motor Home as much as I do mine. I agree with lacota W about the wire coming from the dip stick being a heater. Again congratulations looks like you got a winner.

WOW WOW, love it! Such good shape!