Fire engine is the best engine to swap for . I’ve taken 40mm off the bottom of the sump and shortened the oil pick up on the pump , few tweaks to make the adapter plate fit properly , flywheel skimmed both sides to fit .
You need to be able to fabricate a few parts yourself , all the major parts are available off the shelf . I’m just fitting 2 1/4 “ coilover’s on the rear of mine . I’m also making an alloy inlet manifold for twin 40 Weber’s .
My mate bent the tubes up for the cage and I fitted it in , he’s in worthing and could make one for you .? I may be able to get the main hoop and front side bars bent up for you if you can weld .??