Is this worth it? 1974 440

I would second the "leave it as much alone as you can" deal. I would plan to do a couple things since you're there... Pull a spark plug and get the number off it. Make sure it's not anything special for the RV. Replace the water pump housing and pulleys with the 383 prts. Replace the distributor with an MP performance unit. Get the manifolds I mention in your other post... A place on Big block dart.com sells hipo manifolds that are modified to fit the A chassis. I've only seen/held one set but they seem to fit well and were IIRC $300 vs big $$ for headers. Also, the RV transmission may not fit your car. You need a non-truck tailhousing which means all different internals in most cases. Bigger RVs had the parking brake on the tranny tailhousing and that DEFINATELY won't fit. Some trucks came with pass car trannys.. the difference is the access plate for the tailhousing retaining clip... The truck has it on the side and will hit the floorpan of the A body tunnel. Pass car versions have the cover directly above (between the bolt holes) for the transmission mount.