1.8 won't make much over 160 or so bhp mate with bodies alone will need some moderate headwork and if you want more power raised compression, different pistons and rods. Speak to STBash from FFOC he is currently doing this conversion probably best person to speak to M-Tech are also very good at this stuff would be good to speak to them also. I'm making 145bhp with cams, under drive pulleys, vernier pulleys, ST manifold etc etc etc with bodies doubt I'd make much over 160bhp probably be around there but to take advantage of motorbike throttle bodies need to have a higher rpm limit as they more suited for higher revving engines like motorbikes obviously if you went for car specific throttle bodies from Jenvey or similar would be slightly different story but with standalone as well I'd get some ARP rod bolts maybe even change rods and set rev limit to around 7300-7400rpm especially with cams and headwork most of the gain comes in the more you rev with throttle bodies and mdoerate/heavy tuned N/A engines.