When the taigen M4A3 76 mm is released, you can purchase one, and then buy a tamiya sherman kit and build the chassis and put the upper hull of the taigen on the tamiya hull. Boom EZ8 with taigen electronics. yes very expensive I know, but I kinda assume they will fit as the HL hull fits great on the tamiya chassis. If tou do this then you can part out the left lver tamiya parts on ebay and the taigen sherman hull.
Your other option is to purchase the tamiya hvss bogies and rollers and mount them on the taigen hull, which I think would be much more difficult.
the other option is completely rebuild a tamiya into an E8 with a nick kit and turret. Which was a big project even for an experienced modeler like myself. I just finished mine which took alot of trial and error and such to get it all working in the urethane turret.