How can you get a good deal of more torque and a little bit more horse power out of a stock 1994 305 engine that was in your c1500 you already changed all the filters and oils It has 190500 miles?

K&N air filter, flowmaster exaust. 190K is kinda late to modify engine a whole bunch. Dont get it hot it wont last. aahhh to be young again headers and high flow exhaust componants, and maybe a high performance ignition system and some new plugs....if you want to do any serious modifications (new cam, valves, pistons, ETC) you will need to do a COMPLETE rebuild or it wont last at all.