Hey guys i am the other guy in the project, we are not going to run the ass out of the motor as yes we want a little reliability and there is no way we will get that with 14psi for sure , as it is the fuel has been sorted with a 4-6psi pump, the head is going to be decomp with a A14 head and thick gasket, L20 valves i am tryin to find out if they will fit or we will just get double's for it, and there is no way we are converting it to lpg no matter what the gains may be, as for the comment of the waste of a good datto , we dont think so as it will be a race car so if thats a waste to you but a gain for us sorry... if we blow it up as stated there are A14 flattop pistons to go in it so the cost is cheap as they dont have to be made oversized just take the block out to suit...already checked that out, as for the diff it will be welded with torsion bars and a brace put in for good measure which is all going to be made by ourselves, if it blows there will be a bluebird diff for replace, by our calcs as we have both owned datto's there will be a good chance the car will survive the batterin it is going to get as it wont be strangled throttle open gettin off the line at the drags , launch is going to be a key to keeping the car in one piece and not detonating either the motor or the rest of the drive line....... feel free to reply with info but don't try burst our bubble with no you cant do it , thats no help to us try recommending something a little better that we have planned already.... CHEEERS