no bro. thats nothing to worry about. an engine does not necessarily weigh more just cz its got more torque or its 500cc greater in capacity.
Suspension depends upon the body framework, not on the engine. In the twoo dee version, indus is using a bit hard springs in the shocks just to withstand the weight of the 2c engine, which really weighs alot more than the 2nzfe or the 1zz/zr fe.
Replacing the shocks with premio ones is, IMHO, just a psychotic satisfaction because one feels k "shock japani hain".
Its not feasible at all to open up the whole suspension of ur car when its in perfect nick bro.