Bought a Classic with a 260 hp cracked block. Has a stock Alpha drive. Looking to add speed. Can the outdrive handle 325 to 350 Hp or is a Bravo needed. Can I swap out the cracked block for a 383/350 and have the existing components match up. Lastly assuming the stock 260 was able to do 60mph, would 70 to 75 be reachable with the 383 block. Thanks