Wilbur,
I'm the one that built the 302 Jimmy using Hudson rods. I originally tried to buy a set of aluminum rods from Bob Johanson but got screwed out of the $600 I sent him, and finally had to get half the money thru a collection agency.
At that point a friend and I researched rods and came up with the Hudson rod. It's 1.125" longer than the Jimmy which let me run a much shorter, and lighter, piston. I had custom JE pistons made and with the lighter piston, rod and wrist pin each piston/rod/wrist pin assembly was 1.25 POUNDS lighter than the stock Jimmy assembly.
The engine is in a HAMB dragster and we hold the HAGR records for MPH & ET. The engine made 346 HP and 347 TQ on our DTS dyno. We turn the engine 6000 rpm all the time without any problems.
Lots of work, time, money to build a good Jimmy.
Ron
