ClassicCar

i bought a 413/426 motorhome motor yrs. ago for a project but opted for another project and this one never happened.i still have the engine and its in great shape but i have only been able to find minable info about it and no written info which is what i want.every time i mention this motor to someone they think its a worthless truck motor.i have enough info to know its not,but it is stampted oddly a 426 block and the stamp boss says 413.i know 413 & 426 share the same block and it does have a steel crank.the block #'s are on top of the flywheel on back side of engine,industrial 2658826,7-14-70 date stamp is on side of block and rods are standard 1851535,the heads are 2899943 small valve and i have only been able to find info about these heads on one mopar site but my computer crashed,i lost the info and have not been able to find it again.the motor came out of a 72' superior motorhome.i bought it from the original owner who wanted more power and bought a 440.again i'm looking for printed info,books about this motor.somebody help because i'm getting know where fast.