The non-adjustable valve train from any RB motor will work in your application and I am sure there are many Moparts members that will be happy to swap parts with you Of course that is assuming you have a hydraulic cam...you could also do a cam swap to a mild cam like the repro Road Runner / GTX cam for a little more go. JMHO
1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction 1998 Ram 2500 QuadCab, new daily driver. 2008 Honda Element 2014 Carry-On 7x14 Cargo Trailer