I'm getting ready to purchase the B74.2D. It will be my first 4wd. My local track is a small clay track. The class is 13.5. Can soneone give some recommendations on electronics I should try on this build ? I'm about 6 months into enjoying the rc racing hobby and have been driving 2wd 21.5 associated.

Hobbywing esc/motor are common. Motors are usually more of a personal preference

If you want easy you can buy all Reedy stuff. I have yet to run the servos but Im going to try them next, all my friends on the AE team like them.

I can for sure recommend the batteries and motors. I have 3 year old reedy batteries that are just now getting too old. Although for motors I would recommend the new fantom helix, just get the cheapest one and get a good aluminum fan and keep it under 155deg and it'll last a long time. The other Fantom electronics are also a good bet.