Hi Norvaldo,
It should work out great, replacing the LA .46 with an MVVS .49 is a bit like ditching a ST 46 for a 60!
It should have heaps of grunt in that size model. May take a big shoe horn to make it fit though!
Even though I like my LA .46, the MVVS is a true stunt engine and I found it was a lot less finicky to get the type of run that I liked from the .49.
Cheers, Rob.