ultima 80 inch cases with indian crank

[01fxsts]

Im looking for some advive on a couple things here. I have a set of 80 inch ultima cases on the way.I picked up a set of the power plus indian flywheels, on their way also. The flywheels are the same stroke as a stock evo, and the rods are the same length . The are supposed to bolt right into evo cases, but the note the pinion is 1/4 inch longer(like bigger motors they say). When you look at ultimas 5 piece flywheels they say they have the standard pinion then there is a note . the note says ( this shaft has a long bushin end allowing it to be used on 1990 and later model engines with the stronger 84 -99 style shaft gear components. you must order midwest part # 98-570 pinioon conversion package if using it on 90 and later engines. a quarter inch is a pretty visable thing. when you look at a picture of the indians and any pic of as stock late model evo they are the same length bushing end. I am going to buy all of the gear components from the diagram ultima has of the evo. I know people to give me quite a few stock parts like heads ,juggs, pistons ,and rockers.My main question is does anyone know what this conversion part is. Is it a pinion gear with a reduced length. or mabe i probably wont even need it. I dont want to by a regular pinion if it isnt even what i need. I do understand that i may end up changing the whole pinion shaft, just hoping not. I have a couple manuals on the way with specs and tolerences, just hoping to get a jump on some of the figuring. turned wrench all my life but have never touched a evo yet. just hoping for some input from the experienced guys .