ive just finished mine with a turbo -

pistons sent off and got milled down or strengthened to lower comp

conrods were also sent of to be heat treated and pinshotted for extr strength

arp con rod bolts

kent cam uprated valve springs

now, i didnt do all this for moe power but merely to get the t230 up to spec but with injectors good loom etc u should see 250 bhp reliable.

depending on where u are i have a guy who is mobile and honest and doesnt charge thru the roof he mostly does north london but if its worth his while he may travel further...

good luck with the build