I believe Jenkins 74 "Shovel nose" vega was his first McPhereson strut car, prior to that they were the conventional Back halved w conventional front UCA/LCA spring cars, I'm sure the original 72 car was (which I believe was the same car he ran in 73), 72 was all white and in 73 he added the candy red. 74 was the 'all new' car but by then the Gapp & Roush, Nicholson and Glidden 351C cars were already starting to become dominant in the Class.

IIRC the 73 weight breaks were 7 lb/ci Hemi, 6.5 Lb/CI Wedge and 6.75/ lb/ci for the Canted valve motors like the BBC and the 351C....Jekins saw he could get the rear weight distribution better with the strut suspension and when Mopar went to a destroked 396 and 366 Hemis the tube frame was really the only way to ge the weight down to competitive numbers. A little later they went to the over under 105" WB break which was aimed at making the Big Blocks more competitive again but unexpectedly brought in the G&R Maverick Taxi and later the 70 Mustangs of Nicholson and Glidden.