If your considering fuel injection do it for the tinkering and fun factor brought by a self adjusting and easy to tune system. I say this because the cost of the correct and complete conversion to a Sniper type system will be around $3000. The added expense of switching to FI could buy a lot of gas- even at $3 per gallon. Also keep in mind the Sniper type systems are not built to OEM quality nor do they offer the diagnosing that an OBD2 OEM system does. Some think the aftermarket systems offer the same monitoring and DTC code displays of an OEM system and they do not. Your dual quad set up- although not super super valuable will still bring you a nice bit of money if you sell it.