I'm right on the limit with my standard rods and pistons. Once the rods and pistons have been done, you'd be safe over 270bhp, you would also really need to up the exhaust to 3" system throughout, change the pulley, blower cams, crank, balance shaft delete and onto the Harrop unit for 300bhp +. It really is how much you have to spend??? Don't forget, you have to transfer that power through the front wheels too. Uprated clutch and a ATB diff would be essential.
Suspension mods and bigger brakes??