Y7 Obd0 Swap

[1.6REXER]

Hi to all
noob here to the AF. got some questions concerning a Y7 Short block I purchased. I own a HF 91 with orig. 1.5 b6 engine. 245k miles very pampered(since Ive owned it). The Y7 is going to be dropping into my rex pretty soon I know all my parts are compatible with Y7 and I would need to keep it obd0 to save from headaches. 1.) but does the Hf Distr.(same as the si) bolt right on or is there some modify to it? 2.)My HF IM not the IM of choice but since I am on a very tight budget would work for now and I can keep my Hf harness. But does the wiring harness require modification to run a SI ECU? 3.) Does the IM need any mods to fit the Y7 head. I will put up pics as soon as I can If some knows how let me know.
Thanks for the help and any support