Some place to check is Quick Time. They makes all kinds of flexplates. I did not see anything with 142 teeth ring gear.

Originally Posted By 340Cuda
They made one for me (R-3 crank with Chevy bolt pattern).


This one works if for an R-3 crank with Chevy bolt pattern and a GM convertor.

http://www.jegs.com/i/Quick-Time-Bellhousing/698/RM-946/10002/-1