Unless you have a 109 block, or a block that has an oil passage around the top of the front cam bearing, you may have a problem putting a roller cam in. On a flat tappet cam, the front bearing journal has a groove in it to let oil pass to the drivers side lifters. Roller cams do not have the groove, at least not the ones I have seen. You have to grind a passage into the block above the front cam bearing, use TA Performance rear groove cam bearings, or find someone to groove the cam journal. Full Throttle also now stocks rear groove bearings. Any roller cam that is off the shelf will be for a turbo engine. You would need a custom grind from Comp or another company for a N/A engine to get the best performance. A turbo cam will work, but they are designed for turbo engines, not N/A. The cost is not much more for a custom grind. Also, regarding 8445 heads, the only difference I can see in any high port heads is the bridged water passages at the front and rear of the heads. The bridge tends to keep the head gaskets from leaking coolant into the front and rear cylinders.