How much horsepower can each hold? I know the 154 is stronger but, the problem is I have a SC300 And I will be dropping a 1JZ into it but the thing is that the supra 154 isnt long enough. The JDM Soarer R-154 has a longer tail shaft and the shifter is farther back, but it is so hard to find one of those. SO i was thinking about using a W-58 from a MKIV. What kind of rear end should I use with that combo?