Yes, they return no problem with just the spring action in the vacuum diaphragm.

This car will use a trans brake too. No footbrake (maybe on accassion).

Cam is not wild, but not stock either:

Intake- 248@.050 & .604lift
>Exhaust- 254@.050 & .591lift
>Lobe sep is 114
>lobe #`s: 4875B/4876B sn#-A6105

Compression is 10.5:1