Im planing on tuning my ls and i wanted to slap a b16 on it but will the car still be good for daily driving and i heard it will have oil leak problem...should i vtec my ls or jus do i/e/h???

If you go to a shop that does a good job the LS/VTEC will be fine as a daily driver and you will have no oil leak problems. These stories you hear are ppl who have done the LS/VTEC wrong and automatically label the LS/VTEC idea as the problem rather than poor work.