http://www.allpar.com/mopar/318.html
318 throttle-body / roller-cam engines (by Vince Spinelli and Jack Perkins)

The throttle-body fuel-injected 318 motor had a few changes for its model year (1988), which would come to the 360 in 1989.
First, Chrysler finally switched from standard hydraulic lifters (and matching camshaft) over to a roller hydraulic lifter and a new matching camshaft. The roller design allowed for a steeper cam profile, and thus a more precise valve-train actuation.
Second, the 2 barrel TPI fuel injection intake replaced the carburetor. [Webmaster note: the company was still intent on cost savings, and six more fuel injectors per engine does add up; still, others had been using multiple-port injection for some time — it had been standard in the Volkswagen Rabbit since 1979.]
Third… the heads were different; the basic casting is the same, but the fine points were not. To make better use of the fuel injection, swirl intake ports were introduced. To accommodate a slightly changed pushrod angle (the new roller lifters were taller than the standard hydraulics), the push rod guide holes in the cylinder heads were changed from roughly 0.5 inches to a published 0.66 inches (Dodge DW Series Truck Factory Service Manual, 1988). Upon measurement, this was confirmed to within an accuracy of 0.01 inches. Push rod length changed from about 7.5” down to 6.78”, and diameter shrunk from 0.360” to 0.3125” (again to accommodate the changed push rod angle).

 

i think only the magnums came stock with rollers. flat tappet will work but rollers are deff. better. and if you are doing all of this would go ahead and get rid of the TBI and put a carb on it. tbi is not good for performance or mileage.


*EDIT* we posted at the same time, i guess i was wrong, lol. me bad bigkat91

 

If i go with the carb can i still use the same fuel delivery system or would i have to lower the pressure some how?

 

You will need to Lower fuel pressure and change quite a bit, from the ignition system to wires to hook up to the gauges and more. FI will give you better MPG and horsepower than any stock style carb setup.

 

I think ill stick with the factory two barrel tbi, just to make things simpler to go back together, with a .480'' lift cam, i believe that the factory lift is .4", on both the exhaust and intake, roller rockers and new oem roller lifters, new KB flat top piston so that tdc is at the same height as the deck. I am wondering if the higher compresson and mild cam upgrade will throw any codes.

http://www.hotrod.com/howto/113_0304.../photo_02.html this shows what I am talking about the pistons below the deck at tdc.