Try Graham Probyn near Uttoxeter.
https://www.midlandraceandrally.com/
Highly knowledgeable and professional and not expensive either.
Has built, prepared, restored and engineered cars from club level stuff to LMP2 via GT4 Astons, Historic F3, TVR Tuscans, F Fords, Caterhams, Super Vee etc etc.
I can’t recommend him highly enough.