I know this an older thread but I'll input my 3 year of experience with this exact cam, I didn't need a retrofit kit as my LA 360 was already a roller from factory. This is a very good cam, I've had little to no issues with it. Awesome mid-range. Great street cam, although a bit on the mild side.
I still use a mechanical fuel pump so no I did not have an issue with snout length. But again I just bought the cam itself, used the stock roller lifters and a Cloyes Double roller timing chain. As well as upgraded the valve springs, rockers etc.
I'm really thinking about bumping up to this cam: 20200712
Voodoo Retro-Fit Hydraulic Roller Cam - Chrysler 273-360 282/290
Which is what I should've done in the first place, especially with 9.7 compression.
