The Portosonic info came from period articles on the car.
There's another article on another of the early cars that shows the engine & compartment, but I no longer have it - gave it to the car's new owner.
May have been an old SS&DI issue, the car was white & as I recall a darker color was showing through in spots underhood, probably from gas spills.
I recall the LD340 being the hot tip for street/strip.
The "1971" car is actually a '70 - jit got the updated Sharktooth grille so he could run the T-quad.
Funny you should also mention Cecil; been friends with him for decades & worked for him for a bit.