A lot of things could be causing that. First did you check your coolant?
It can be one of these 3 things...1 Throttle position sensor..2 Mass airflow senser...3 Map senser
Check for low coolant level.
123456
If they are both Chevy V8 cars it will bolt up.
What parts??? Body, engine, suspension???
Instead of having a 2.8 v6 or non h.o 305. It would have a 350 tpi or high output 305. It would have a different spoiler , suspension , and have formula stickers on the doors.
The cool water hitting your piping hot exhaust makes the metal contract (Shrink) and it makes a ticking noise.
15.5 Gallons
A likely cause is an internally restricted radiator.
If its a V8, its going to be .035
Water pump, Radiator, thermostat, low coolant, blown head gasket, busted hose. Could be one or all but I would check these first.
On the drivers side firewall