Apart from the obvious suggestions of ringing around some scrappies, and looking in the front/back of your local Autotrader for exchange/recon engine suppliers, it might be worth noting that the 1.7d is an isuzu engine, so some of the jap engine importers might be able to help.
My comiserations :)
Most definitely it will, however this will be counted as a modification - a engine mod in fact, which will push your insurance premium up drmatically.
It's almost certainly more sensible to sell your current car and buy a genuine td - the insurance probably won't change by much that way. (plus you have the option of upgrading to a better car than an astra ;-)
'94 Vauxhall Astrays used a vauxhall Diseasal engine that was absolute s**te! they only used it for about 12 months before sticking the Izuzu engine in! Most common fault of the Vx diseasal engine was sticking a rod through the side of the block! Becasue of the (thankfully) limited run working Vx diseasal blocks are hens teeth! Or rocking horse shit, whichever you prefere! ;)
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