IMO, dont touch it until you have some idea of what you are doing. Do some reasearch, look at some pics, check out some other intakes.
Definetly get new gaskets.
What heads are on there? What intake is it?
If its stock heads and stock intake, use a stock gasket. Trust me, there is PLENTY of material to be removed to match up to a stock head. The stock gasket matches up real well to a stock head, but the intake doesnt. If you opened it up to a 1250, youd be hurting yourself unless you had the lower welded/epoxied. Bellmouthing the ports is a BAD idea.