MSD LS Ignition Control Box for LS1/ LS3/ LS6 allows you to install a carburetor on your LS-based engine. Matching factory-type connectors for the coils, crank sensor, MAP sensor, & the cam sensor. Features a 2-step rev limiter, a vacuum advance curve for cruising economy, & even a step retard for nitrous use. Controller activation is programmable via the included software on a PC. Fel-Pro gaskets are included with these kits.