Update on buying 70 Plymouth Duster from below

Well went ahead and bought the Duster, has a nice sounding and really sweet running 340 in it, from what I have been told it is a H code 340, built .30 over with an upgraded purple cam, Holley 650 with an Edelbrock intake, the trans is an automatic that was just built also, 3000 stall converter, has a Cheetah SCS reverse pattern manual shifter, ceramic coated long tube headers all going through a TTI full 2 1/2 inch exhaust with Flowmasters on it, lots of other goodies on the suspension too, now my big question is I am wanting to put an MSD box on it and do away with the stock ignition system, any ideas as to what MSD I need and how hard is it to install, thanks for any information.

Attached Images
File Type: jpg 70 Duster 2.jpg (87.0 KB)
File Type: jpg 70 Duster.jpg (58.7 KB)
Author: Hibred