running sluggish....no codes also

my car has b-303 cam, cai, ud pulley, ported and polished heads and intakes, 2800 stall and shiftkit, person i got it from said it was close to 300 hp. but it is 3" piping after the first 2 cats. and no i dont have a chip. how would i check the timing?

the heads and intakes are ported stock ones, i dont have any pics of the engine, sry

ok here is what i have found out. we checked the timing on the car and we set it back to the stock 10 degree timing and i couldnt even put it into gear without it dying and the idle was really lousy. we had to turn the thing close to an inch so it would run halfway decent. i also disconnected the egr and it didnt run any better or worse. but since we checked the timing my transmission has been going crazy also. when at a stop and i give it gas sometimes it acts like it is not in gear and just revs and when i am going like 70 and start slowing down it acts like it doesnt know what gear it is suppose to be in and it will downshift then upshift until i am going at like around 35 mph. well i hope this helps a little if you need more info just ask and i can check. i am going to take it into the shop tommorow because the trans is still under warranty.

its at the shop now