I have been thinking about a cam from Hughes Engines #Heh-1019AL rated for Rv, towing and 4X4's. It has 210/219 @.050 with.461/.489 lift on 112LSA. Dave is the first one to think this might work. I am not expecting 20 MPG or a powerful truck. I have bigblocks for that. I once wrote to a Mopar magazine and proposed this idea using a 273 block and a 360 crank ground to fit the mains. This would produce a 300 cubic inch motor with a long stroke for torque. The editor said it was a stupid idea and to stick with the 360. The Ford Crown Victoria police cars make good power and mileage with a 4.6 liter V8. 273 is 4.5 liter. The Ford 4.6 has a bore of 3.55 X 3.55 stroke. Have a LITTLE FAITH IN THE LOWLY DISRESPECTED 273. I think with a few modern parts it might meet my goals. I intend to do this and will report back.