its worth it if its what u want mate, if you wanna go fast cheaply then no its not becuse ur building a bespoke engine not buying off the shelf

a good one built by a professional will cost u like 7k maybe 8k all in running managment, turbo etc

but u can easily do it your self for under 4k PF did it a while ago used black top 2.0 zetec, wossner pistions, std rods but shoot peened, uprated pins, frs turbo and manifold, zetec inlet, cossie injectors and gotec pro managment whink thats was all like 3.5k or something and made 24o odd bhp on low boost

they had some agg bein a black top but just use a silver top insted

u can use cossie managment and an escort rs t3 and manifold with adaptor plate, efi inlets, allsorts

it would prob be cheaper to but a frs engine and turbo and use after market managment but its finding one