It is computer controlled, with a TPS sensor.

 

okie dokie. thanks guys already you guys helped out a lot. oh yeah i drove it today and oh my god im going to love owning it. it drives so smooth im not used to it. and listening to that chevy v-8 pur while driving is amazing to hear again. last time i heard it was with my dad's 68 flatbed. im in love all over again. oh yeah i also like the feel of being low looking over a long hood. i might keep the cowl hood just for the looks of it.