Had a 305 Chevy under the 3" set back in my 1922 Dodge track roadster. No Dist. in place yet. Well brother-in-law Lary stops by and says "got enough room for the dist.?". Sure says me. Lacked ~2" of height to accommodate the HEI. I am in full panic mode. Do not want to cut a gap in the cowell, nor can the engine be lowered. It is 4" off the pavement already. Geesh! Good ole internet to the rescue. Found a Fierro sight where some were dropping in 350 Chevys and needed the top room for the distributor. Do not remember the originator so credit could be given for genius. Take a 1976 Chevy six cylinder HEI dist. cap. Cut it off just above the mounting screw heads (gulp) so I did. Then get a 1996 Chevy pickup crab cap and rotor. Cut off the bottom of this cap along with the plastic webs which act as wiring terminal supports. It has to have a semi tight fit into the lower cap. This part is hard part. the dist. has to be timed and aligned so the rotor is timed correctly and the rotor has to be within .060 of the cap terminals. took me ~ 28 tries. Watch carefully that the upper cap terminals do not block the access to the hold down screws. Then epoxy it together. Rough up the epoxied surfaces before gluing. There will be holes between the two pieces. Just back these with masking tape and fill. The setup fired the first time. Was I happy and relieved.