94 Z28 LT1 / 4L60 swap into 79 Malibu Wagon

Free time is limited but the project is moving forward nonetheless.

In final wiring layout I'll have the PCM and the relay / fuse block on the fender well, battery side to keep wiring as short as possible. I'm using a junction box in that area too which I plan to conceal the soldered splices for a clean look. On the factory F body wiring setup they had one of the PCM grounds going to the underside of the block and others going to the head near the coil. I plan to install a ground terminal block close to the battery, connected to the battery ground post and also a decent size ground conductor running to the engine block / head. The engine will also be grounded to both the frame and the firewall with typical braided straps.

On the grounds for the PCM, (theres 3 or 4 cant remenber), I'd like to keep them as short as possible so can I combine them on the ground terminal block that I install near the battery? Or, should I keep them routed like they were in the factory F body setup?

Thanks