Why wont my ford telstar 2L turbo 1986 model engine start after changing the hea

[stu84]

why wont my ford telstar 2L turbo 1986 model engine start after changing the head gasket and putting a aftermarket turbo on it a garret ar 48? Does it have oxygen sensors or oil sensors? also overheating after taking thermostat out and waterpump is working fine

 

[Chicano]

How can it overheat and water pump work fine if it wont start? Please clear-up that confusion so you can get help.