Unfortunately, a 1997 Toyota Supra engine and trans would not fit into a 1990 Mazda Miata. The Supra engine and transmission are unable to be mounted correctly within a Miata to make them fit.
The 2002 Mazda MX-5-Miata has an inline 4 engine.
The 2009 Mazda MX-5-Miata has an inline 4 engine.
The 2004 Mazda MX-5-Miata has an inline 4 engine.
The 2003 Mazda MX-5-Miata has an inline 4 engine.
The 2007 Mazda MX-5-Miata has an inline 4 engine.
The 2013 Mazda MX-5-Miata has an inline 4 engine.
The 2014 Mazda MX-5-Miata has an inline 4 engine.
The 2008 Mazda MX-5-Miata has an inline 4 engine.
The 2001 Mazda MX-5-Miata has an inline 4 engine.
The 2011 Mazda MX-5-Miata has an inline 4 engine.
The 2012 Mazda MX-5-Miata has an inline 4 engine.
The 2005 Mazda MX-5-Miata has an inline 4 engine.