My LCF has a strap from battery to firewall and another from toe board to engine. I added a battery cable from negative battery to engine. I don't remember a strap from the cab to the frame but everything is working nicely.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy