Magnum heads on 1970 block

I did that swap on an '87 360 block. Used stock throttle cable and Lokar KD cable. Watch your pushrod length, pushrod clearance and where the roller rockers sit on your valve spring. I actually had to remove some material from the intake side of the head for clearance, I could just get my fingernail inbetween the pushrod hole and the pushrod. I also had to give the lock nut for the roller rocker an extra half turn so it would sit at the right location. I had the pushrods from MOPAR for the stock magnum conversion but MOPAR discontinued that part. You may have to get a set made. I have a Comp Cams Hyd flat tappet cam. I like this swap, woke my engine up a bit. Found out later that the heads had the infamnous hairline crack between the valves. Use ARP bolts and lube
If I can help you at all shoot me a message.