It is street legal and I drive it almost daily on nice days. It is a 1971 Manta with 34,000 original miles. I have had 28 Opels over the years, mostly Manta's and Ascona's, and this is the cleanest body car I have ever seen. Never any rust and wonderful trim. I spent almost five years building this one, primarily due to financial limits.
It has a 2.4 with a fully ported cylinder head and twin 45mm Weber sidedraft carbs. I had extensive work done to the valve train including titanium valve spring retainers and platforms for the dual springs. The cam is a 244 @ .50 intake and 234 @ .50 exhaust and uses solid lifters. It uses a 3 quart accusump, an MSD ignition, 2.5" exhaust with straight through mufflers and a custom made cold air intake system that draws air through the headlamp opening. I also run a 8.5 pound aluminum flywheel with an S-10 clutch set up. The engine is mated to a Getrag 5 speed transmission and a ZF limited slip differential with 3:67 gears.