Years ago I worked for the largest re-manufacture of aftermarket staters and alternators in the US and that oem manufactures would use the same unit in different applications with the only amp difference being the pulley size.
Same concept as under drive pulleys you see for the 5. 0's and other gassers.
I bet if you were to get a lager pulley you would get what you want. Plus our trucks were stock with a 130amp unit. These rated at idle when they rate them. It is around a 3:1 rating. Motor 1000 rpm unit is 3000 rpm.
If you want a bigger unit pm me and my buddy owns pa performance, they do customer alternators for 5. 0 and other cars. . I can look into what a pulley can do and get you one. A pulley only $10-15. .
On a side note, 130 amp is a very conservative rating. . I sure it is higher.