I have five 730 ECMs, one 870 ECM, and one 746. I also have two corvette 727s which are the same as the 730, only weatherproof so they mount in the engine compartment. The 730 is used on 90-92 Speed Density TPI cars. The 870 was a 1985 TPI model, and the 746 is for all TBI cars. Asking $50 including shipping to the lower 48 states. $35 for the TBI computer. Some of them have the tray, I'll throw that in if you want it. Email me with any questions. I can get pics of the ECMs if you email me at aarra002@yahoo.com.