based on those things, you'll get more torque for sure. But if you go 77mm you should try to find the 4G18 crank and get that fitted in too. Do a PNP too since everything is out.okay...I think is fb issue.
The package is like this
* Art Piston 75.5mm/76mm/77mm
* Head Port & Polish
* BC Camshaft
* BC Valve Spring
* Matel Gasket
* King Bearing
* Crank Balancing
* Labour Charge
* Warranty 6 Bulan
* FREE Dyno
RM3.5k and yes that is quite some $$$
But having said that 3500 + crank (used is about 800 bucks) and PNP job about 1500 give or take, that can get you a 4G93 already..... so pros and cons...