yah i have 150k miles…and im planning on doing lsvtec with this rediculously high mile motor cause im pretty budget honda tuner dude so yah…what would be the most likely thing to break on the bottom end…connecting rods?..what should i make stronger so this motor will be able to take the vtec head and be somewhat reliable…but yah im planning on blowing up so i atleast want to enjoy it for a month. thanks 
If you go ls/vtec I would plan on replacing the bearings and use arp rod bolts instead of stock rod bolts as a start. You will also need to replace your pistons. When you do that either hone or overbore the block to the new size piston you will be using.