ok i over heatedmy 91rs 305tbi trying to get back from work 1 day andi replaced the thermstat plugs and fushed the coolant
whenever i start the car it smokes out the exhaust pipes i i hi the gas it just pours out whats the problem here what can i do to fix it

 

I'm no expert but it sound like you blew the gasket or cracked a head. Watch your spark plugs and figure out which side it is. Then you'll have to remove the head, replace the gasket. If you cannnot see a crack, get it to an engine shop to have it magnafluxed.

 

or id check for a warped or cracked head, maybe even a cracked block. Something is letting alot of coolant into the combustion chambers.